For effective relief and recovery from child birth, hemorrhoids, fistulas, lower back pain, tailbone injury and prostate surgery. Filled with silicone fiber, has some of the features of natural wool: anti-dust mite, anti-bacteria, anti-fungus, anti-odour, soft, breathable and washable. Donut soft and comfortable yet firm enough to prevent compressing under normal weight load. Suitable for use with most seats including office chairs, wheelchairs and chairs and sofas. Washable by hand or gentle machine with cold water and non-abrasive detergents. Brush and shake regularly to extend effectiveness and product lifespan.